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What pathogen causes privet leaf spot?
The pathogen of privet leaf spot is: Phyllosticta ligustri, a fungus of the Deuteromycotina. The pycnidia form on the leaf surface, initially immersed, scattered or clustered, later breaking through the epidermis and becoming exposed, lens-shaped, measuring 72 to 88 microns. The conidia are nearly oblong, single-celled and colorless, containing 2 oil droplets, measuring 5 to 7 by 2.5 to 3 (microns).
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Symptoms and Control Methods of Privet Leaf Rust
Privet, also known as wintergreen and wax insect tree, is an evergreen small tree native to China and Japan. It likes light and tolerates slight shade, prefers warm and humid conditions, is suitable for slightly alkaline soil, is slightly cold-resistant, and has strong resistance to air pollution. Privet is a commonly used landscaping tree in courtyards and can be used as hedges and courtyard landscaping trees. Symptoms: Round brown spots appear on the surface of infected leaves and gradually become sunken, while the corresponding parts on the back of the leaves bulge. The mesophyll of the diseased area thickens and turns yellow or purplish red, after which many cup-shaped rust spore receptacles grow on the raised spots. Rust spores
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What plant is Japanese golden-leaf privet (Ligustrum sinense 'Variegatum', also known as Golden Privet)?
Characteristics: Also known as Howardi privet, it is a plant variety in the genus Ligustrum of the family Oleaceae. It is an evergreen small tree with greenish drooping branches bearing white spots. The leaves are opposite, simple, ovate; the young leaves are golden yellow, and the leaves are thick and leathery with a bright luster, with ornamental value clearly superior to yellow-leaved varieties such as golden-leaf privet and golden-leaf boxwood. It has good resistance, tolerates cold and high temperatures, and has strong adaptability. It bears panicle inflorescences with white flowers. The fruit is dark purple and elliptical. It is suitable for cultivation in East China, South China, Central China and other regions. Suitable for color blocks, hedges and spherical
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How to prevent and control leaf spot disease in Chinese privet (Ligustrum quihoui)?
Ligustrum quihoui, a plant of the genus Ligustrum in the family Oleaceae, is an excellent colored shrub that has been widely planted in recent years. However, as the planting area has expanded and the planting years have increased, some of its shortcomings have gradually emerged. Especially with old seedlings, during the rainy season every year, leaf drop of varying degrees occurs, and it happens year after year, seriously affecting the landscape effect. According to observation, the cause of this condition is golden privet leaf spot disease. Through preliminary observation and research, the pathogen of Ligustrum quihoui leaf spot disease belongs to the subphylum Deuteromycotina fungi. Round
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Which tree species in stump bonsai are suitable for leaf pruning?
Q: Which tree species in stump bonsai can have their leaves pruned, and what should be noted? A: There are many bonsai tree species suitable for leaf pruning, including Chinese elm (Ulmus parvifolia), Japanese bush cherry (Sageretia thea), ginkgo, Chinese wolfberry (Lycium chinense), red maple, pomegranate, Chinese hackberry (Celtis sinensis), banyan (Ficus microcarpa), and Chinese chaste tree (Vitex negundo), etc. The main benefits of leaf pruning on stumps are: 1. It can make the leaves smaller, which helps display the artistic effect of bonsai in shrinking a dragon into an inch. For example, after leaf pruning on Chinese chaste tree, the newly sprouted leaves can shrink to 1/5 the size of the original leaves; when the banyan has all its leaves and buds removed in early summer, under controlled water and sufficient sunlight, the new leaves can grow
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Causes and Control Methods of Leaf Yellowing in Winter Red Fruit Bonsai
Winter red fruit flowers easily and has a high fruit-setting rate. Its fruits are entirely red, and the fruiting period can extend to the next year's flowering and leafing stage without dropping. It is an excellent variety for fruit-viewing bonsai and is deeply loved by the people. However, during cultivation, due to the limitation of pot capacity and other influences, the leaves often turn yellow and drop. The main causes of yellowing are as follows: Temperature. Winter red fruit prefers warm and humid conditions and likes light but not excessively strong light. Especially in hot summers, strong direct sunlight will make the air dry and raise the pot soil temperature.
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Introduction to the Characteristics and Planting Key Points of the Nine-Leaf Green Sichuan Pepper Variety
The nine-leaf green Sichuan pepper is named for having nine small leaflets on its petiole. It is a first-generation superior variety carefully bred by scientific and technical personnel in Jiangjin City, with the characteristics of fragrant fruit and pure numbing flavor. All its indicators are superior to currently known Sichuan pepper varieties, and its market price is 2--3 times that of other Sichuan pepper varieties. At present, Chongqing Municipality uses the nine-leaf green Sichuan pepper as the preferred tree species for returning farmland to forest. The nine-leaf green Sichuan pepper is a warmth-loving tree species and generally suffers cold damage at around -20°C. It is drought-tolerant and usually grows well in areas with annual precipitation of 600 millimeters; it is barren-tolerant and suitable for various
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Timely Control of the Rice Leaf Roller Is Essential and Cannot Be Delayed
The rice leaf roller is one of the major rice pests in our province. Its larvae damage the leaves, turning rice leaves into a mass of withered white. Especially when it attacks at the booting or heading stage, it will cause a sharp decline in rice yield. This pest has seven generations a year, and the second-generation larvae are the most numerous and cause the most serious damage to early rice. If control is not timely, it will break out in a major outbreak during the heading period, causing incalculable losses. For forecasting the rice leaf roller, the appropriate control timing should be determined based on the forecast of the occurrence period. Based on past conditions, investigation should begin 4 days after the peak of the moth flight
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Causes and Control Measures of Abnormal Leaf Color in Wheat Seedlings
After wheat is sown and emerges, various abnormal discolored seedlings often form due to the influence of natural conditions and cultivation practices. To facilitate management according to seedling condition and targeted treatment, they are described separately below. Causes of yellowing of leaves in yellow-leaf seedlings. First, soil drought. This situation mostly occurs in wheat fields with insufficient subsoil moisture or where moisture escapes through airy soil. Its characteristics are: slow tiller emergence, grayish-green leaf color, short and small central leaves, slow or stagnant growth (which farmers call "shriveled-heart seedlings"), gradual yellowing and withering of the middle and lower leaves, and few and fine roots. Key management points
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Characteristics and Cultivation Methods of Greenleaf Schisandra
Medicinal name: Greenleaf Schisandra. Aliases: Neifengxiao, Xiaoxueteng, Guoshanfeng, Zizuan, Fengshateng. Chinese pinyin: luyewuweizi. Latin botanical animal/mineral name: SchisandraviridisA.C.Smith. Efficacy: dispels wind and invigorates blood; moves qi and relieves pain. Family and genus classification: Schisandraceae. Indications: rheumatic bone pain; stomach pain; hernia pain; irregular menstruation; urticaria; herpes zoster. Ecological environment: grows in forests, on hillside roadsides and by mountain gullies and streams at 250-1200m. Harvest
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